task: add more env var documentation #5760

Job	Run time
build_linux (3.12)	34m 0s
build_linux (3.10)	33m 3s
build_linux (3.13)	33m 20s
build_linux (3.9)	34m 3s
build_windows (3.13)	39m 48s
build_windows (3.10)	38m 51s
build_windows (3.9)	37m 42s
build_windows (3.11)	41m 36s
build_windows (3.12)	36m 29s
build_linux (3.11)	34m 33s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 24s
test_examples_linux (3.11, false, ubuntu-22.04)	7m 53s
test_linux (3.13, false, ubuntu-22.04)	14m 21s
test_linux (3.10, false, ubuntu-22.04)	10m 19s
test_linux (3.11, false, ubuntu-22.04)	9m 40s
test_linux (3.9, false, ubuntu-22.04)	11m 22s
test_linux (3.12, false, ubuntu-22.04)	11m 47s
test_windows (3.9, false, windows-latest)	13m 19s
test_windows (3.11, false, windows-latest)	13m 26s
test_windows (3.12, false, windows-latest)	13m 3s
test_windows (3.10, false, windows-latest)	13m 26s
test_windows (3.13, false, windows-latest)	13m 52s
upload_linux	0s
upload_windows	0s
Clean up anaconda packages	-1s
	8h 21m 16s

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